Lens actuator

Abstract

A lens actuator includes a lens barrel for accommodating the lens, a coil wrapped around the lens barrel, a plurality of magnets, a bracket for mounting the magnets thereon and accommodating the lens barrel therein, and a resilient plate connected between the bracket and the lens barrel to hold the lens barrel on the bracket. A cutout is defined in the edge of the through hole of the plate shaped body corresponding to the respective fixing portions. The lens barrel includes a plurality of fasteners. Each of the fastener includes a shaft extending through the cutouts and protruded out from the lens barrel and a head extending radially outwardly of the shaft at the distal end thereof. The resilient plate and the lens barrel are gripped together by engagement of the cutouts with the respective fasteners.

1. A lens actuator, comprising:
 a lens barrel for accommodating the lens, a coil wrapped around the lens barrel, a plurality of magnets, a bracket for mounting the magnets thereon and accommodating the lens barrel therein, and a resilient plate connected between the bracket and the lens barrel to hold the lens barrel on the bracket, 
 wherein the resilient plate comprises a plate shaped body including
 a through hole defined in the center of the plate shaped body, 
 a plurality of slots defined in the plate shaped body and the slots cooperatively surrounding the through hole, 
 a plurality of fixing portions, wherein each of the slots includes a first substantially straight slot portion, a second substantially straight slot portion and a third substantially straight slot portion, the second substantially straight slot portion interconnects between and substantially perpendicular to the first and second substantially straight slot portions, the slots cooperate to form a square-shaped pattern framing a central axis of the resilient plate, each of the fixing portions is located between the through hole and the junction portion of the second and third substantially straight slot portions of the corresponding slot, and 
 a cutout defined in the edge of the through hole of the plate shaped body corresponding to the respective fixing portions, 
 wherein the lens barrel comprises a plurality of fasteners, each of the fastener comprises a shaft protruded out from the lens barrel and extending through the corresponding cutout and a head extending radially outwardly of the shaft at the distal end thereof, and the resilient plate and the lens barrel are assembled together by engagement of the cutouts with the respective fasteners. 
 
 
   
   
     2. The lens actuator as claimed in  claim 1 , wherein the plate shaped body is substantially a square plate. 
   
   
     3. The lens actuator as claimed in  claim 2 , wherein the plate shaped body includes a first edge, a second edge, a third edge, and a fourth edge, the first edge is substantially parallel to the third edge, and the second edge is substantially parallel to the fourth edge. 
   
   
     4. The lens actuator as claimed in  claim 3 , wherein the plate shaped body includes a plurality of L-shaped resilient portions, each L-shaped resilient portion arranged between two neighboring slots, each L-shaped resilient portion having a uniform width throughout the length thereof. 
   
   
     5. The lens actuator as claimed in  claim 4 , wherein a length of the third substantially straight slot portion of each slot is less than or equal to a length of the first substantially straight slot portion. 
   
   
     6. The lens actuator as claimed in  claim 4 , wherein the plurality of the slots comprises a first slot, a second slot, a third slot, and a fourth slot, the first substantially straight portion of the first slot is substantially parallel to the first edge, the second substantially straight portion of the first slot is substantially parallel to the second edge, the first substantially straight portion of the second slot is substantially parallel to the second edge, the second substantially straight portion of the second slot is substantially parallel to the third edge, the first substantially straight portion of the third slot is substantially parallel to the third edge, the second substantially straight portion of the third slot is substantially parallel to the fourth edge, and the first substantially straight portion of the fourth slot is substantially parallel to the fourth edge, the second substantially straight portion of the third slot is substantially parallel to the first edge. 
   
   
     7. The lens actuator as claimed in  claim 1 , wherein the bracket comprises a hollow frame body and a plurality of magnet mounting holes respectively defined in each side of the frame body, the magnet mounting holes being configured for mounting the magnets therein.